How severe is CVE-2026-21999?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Oracle Corporation Database Server

CVE-2026-21999

Vulnerability in the XML Database component of Oracle Database Server. Supported versions that are affected are 23.4.0-23.26.1. Difficult to exploit vulnerability allows unauthenticated attacker with network access via HTTPS to compromise…

EPSS: 0.000 (11.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N.

Affected products

Oracle Corporation Database Server — versions 23.4.0

References

Oracle Advisory (vendor-advisory)

Frequently asked questions

What is CVE-2026-21999?: CVE-2026-21999 is a medium-severity vulnerability in Oracle Corporation Database Server. CVSS score: 5.3/10. Published 2026-04-21.
How severe is CVE-2026-21999?: Medium severity. CVSS v3 base score is 5.3 out of 10.